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Is it possible to change HeatBalanceAlgorithm from OpenStudio and provide the additionally needed parameters to the materials?

asked 2016-02-03 02:57:48 -0500

Mike06 gravatar image

updated 2016-02-03 10:08:29 -0500

I would like to use Energy+ to model a moisture balance of 1 zone, including the moisture buffering and diffusion in the material. The HAMT-model should do it, but in OpenStudio I have not found a way yet to change "HeatBalanceAlgorithm" and to provide the additional parameters to a construction material. Can anyone help me?

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Hi, I just wanted to circle back around on your questions and see if you came up with a good way to get the HAMT and required additional parameters working in OpenStudio. Thanks!

crupshaw gravatar image crupshaw  ( 2017-01-17 13:52:42 -0500 )edit

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answered 2016-02-03 12:27:33 -0500

You want to click on the "Simulation Settings" tab on the left side of the OpenStudio window (looks like a gear). Them click on "Heat Balance Algorithm" to set the following inputs:

  • Surface temperature upper limit
  • Max surface convection heat transfer coefficient value
  • Min surface convection heat transfer coefficient value
  • Desired algorithm
    • Conduction Transfer Function
    • Moisture Penetration Depth Conduction Transfer Function
    • Conduction Finite Difference
    • Combined Heat And Moisture Finite Element

Note that from the documentation for the Heat Balance Algorithm object in EnergyPlus, there are other Material Property objects that should be part of the model specifically when trying to use the HAMT-model. It doesn't appear that OpenStudio has this capability in the GUI. The Building Component Library doesn't have an existing Measure to add these objects to a model, so you would need to create a measure. The alternative is to add the Material Property objects by hand to the IDF file generated by OpenStudio.

Selecting heat balance algorithm in OpenStudio

Selecting heat balance algorithm in OpenStudio

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answered 2021-08-31 16:01:03 -0500

I realize it's been 5 years, but I've co-developed a measure that allows you to use the "Effective Moisture Penetration Depth with CTFs" model in OpenStudio. Sharing it here for anyone else who stumbles across this same question. It's easiest to add the measure to the measures tab so you can always keep track of the settings for different materials and change them easily if you make a mistake.

It's been added the the NREL openstudio-model-articulation-gem. The measure is called add_empd_material_properties. You can download the whole gem from the above link and find the specific measure in /lib/measures/add_empd_material_properties after download. You can move that folder to your OpenStudio user measure directory.

Here's an illustration of how I'm suggesting to apply the measure in your model. Drag the measure over to the OpenStudio Measures section for each property you want to apply EMPD properties do. Then you can click on it and fill in all the information. In this method, the properties are added at runtime before the model is simulated, and then it runs. Make sure you have at least 1 material with properties defined in each thermal zone to get it to work.

Happy to answer any questions about how to use it!

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answered 2016-02-11 10:59:56 -0500

Mike06 gravatar image

Thank you for your quick reply. I will try that and see how far I get ...

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You're welcome! For future reference, you should click on the "add a comment" button below an answer if you are sending a reply similar to what you wrote. If you are actually posting a solution to your own question, then feel free to make a separate answer.

Aaron Boranian gravatar image Aaron Boranian  ( 2016-02-11 11:06:17 -0500 )edit

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Asked: 2016-02-03 02:57:48 -0500

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Last updated: Aug 31